.sub-menu-item {
  height: 50px;
  position: relative;
  .title {
    position: relative;
    height: 50px;
    line-height: 50px;
    text-align: center;
    .icon {
      position: absolute;
      top: 0;
      right: 15px;
    }
  }
  .sub-item {
    position: absolute;
    left: 100%;
    top: 0;
    width: 100%;
    background-color: #aaa;
  }
}
